Publisher's Synopsis
Excerpt from Projective Differential Geometry of Developable Surfaces
The theory of the invariants and covariants of system in the case that/6 does not vanish identically, forms a basis for the projective differential geometry of non-developable surfaces. That theory has been developed by Professor wilczynski.* The object of this paper is to give a similar theory for developable surfaces.f The writer takes this Opportunity to thank Professor wilczynski for personally directing this work.
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